›› 2013, Vol. 34 ›› Issue (S2): 110-114.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Analytical solution of moisture migration in crust layer of vacuum preloading zone

WU Yue-dong1,2，SHI Xiao-yan1,2，LIU Jian1,2，DIAO Hong-guo1,2   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China
  • Received:2013-04-16 Online:2013-11-11 Published:2013-11-19

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Abstract: Based on flow theory of unsaturated soil, a model for moisture migration is set up to study steady flow subjected to vacuum preloading. Meanwhile the governing equation and the corresponding analytical solution of pore water pressure distribution are given. The model is first verified by in-situ measured data. Then parameters are analyzed. Results show that the calculated results agree well with the in-situ measured data. Both diffusion flux (Q) and unsaturated coefficient (?) have a marked effect on the formation position, indicating that they affect strength and thickness of unsaturated region. The larger diffusion flux is, the larger matrix suction of soil surface is and the greater variation trend of pore water pressure is. Unsaturated soil is seldom influenced by unsaturated coefficient ? when it is in range of 0.3-1.0 kPa-1.

Key words: vacuum preloading, crust layer, moisture migration model, pore water pressure

CLC Number: 

  • TU 443
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